Taxonomic study of the genus Tetralonioidella Strand from China (Hymenoptera: Apidae: Melectini) Author Niu, Zeqing Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, P. R. China; E-mails: niuzq @ ioz. ac. cn; yuanfeng @ ioz. ac. cn Author Yuan, Feng Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, P. R. China; E-mails: niuzq @ ioz. ac. cn; yuanfeng @ ioz. ac. cn Author Zhu, Chaodong Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, P. R. China; E-mails: niuzq @ ioz. ac. cn; yuanfeng @ ioz. ac. cn & University of Chinese Academy of Sciences, Beijing 100049, P. R. China Corresponding author, E-mail: zhucd @ ioz. ac. cn text Zoological Systematics 2017 42 4 418 445 journal article 10.11865/zs.201718 2095-6827 5366783 25D9FD67-3B6B-4F95-88D1-190FDD5C2E54 Tetralonioidella leigongensis Niu & Zhu , sp. nov. ( Figs 11–12 ) Diagnosis. The new species can be distinguished from other species of Tetralonioidella by its unique shape of S8, its apical margin of median process straight. Description. Male. BL 9.8 mm ( Fig. 11a ); head broader than long, HW: HL= 57: 42 ( Fig. 11b ); gena distinctly narrower than eye, GW: EW = 9: 18; width of metasoma as broad as the width between the tegulae, MtW: MsW = 66: 66. Clypeus broader than long ( Fig. 11b ); apical margin of labrum slightly concave ( Fig. 11c ); antenna short, reaching front margin of tegula, scape conically broadened, as long as F1 to F3 together, flagellomere equal in breadth, F1 longer than broad, nearly 1.25 times as long as broad, F2 long than broad, nearly 1.8 times as long as broad, F3 equal in length with F4, about 1.25 times as long as broad, F5-F10 equal in length, nearly as long as broad, F11 rounded apically, equal in length with F2, about 1.8 times as long as broad ( Fig. 11d ); fore wing with distinct numerous papillae apically ( Fig. 12a ); scutellar spines slender, tapering sharp apically, barely visible between pubescence; inner ramus of hind tarsal claw axe-shaped, arolium present ( Fig. 12b ); ventral surface of apical part of S7 with dense setae laterally, median part slightly convex, nearly bare ( Fig. 12c ); apical margin of median process of S8 straight ( Fig. 12d ); genitalia as illustrated in Fig. 12e (in dorsal view) and Fig. 12f (in lateral view), basal part of gonostylus with crescent-shaped process dorsally, and the process with a few long hairs along dorsal margin, another slender belt-shaped projection with a few long hairs at its apex presented outside ( Fig. 12f ). Clypeus black ( Fig. 11b ); mandible dark reddish-brown; labrum dark yellowish-brown ( Fig. 11c ); antenna dark yellowish-brown beneath ( Fig. 11d ); tegula yellowish-brown ( Fig. 11e ); all legs dark reddish-brown except mediotarsus and distitarsus dark yellowishbrown; hind tarsal claw blackish-brown apically ( Fig. 12b ). Scutum pubescence yellowish ( Figs 11a, e ); clypeus, supraclypeal area covered with white hairs, periphery of antennal socket, paraocular area and front surface of scape covered with yellowish-white hairs ( Fig. 11b ); vertex, genal area, scutum, scutellum, metanotum and episternum covered with dense and long yellowish hairs ( Figs 11a, d–e ); all metasomal terga uniformly covered with thin and short yellowish-brown hairs, T2-T5 with obscure apical hair bands ( Fig. 11f ). Female. Unknown. Material examined. Holotype . ♂ , China , Guizhou , Leishan , Mt. Leigong ( 26º24′N , 108º13′E ; elev. 1000 m ), 3. VII.1988 , coll. Longlong Yang. Figure 11. Tetralonioidella leigongensis Niu & Zhu , sp. nov. , male. a. Body, lateral view. b. Head, frontal view. c. Labrum, frontal view. d. Antenna. e. Mesosoma, dorsal view. f. Metasoma, dorsal view. Scale bars =1 mm. Distribution. China ( Guizhou ). Etymology. The type location Mt. Leigong ( Guizhou , China ) is given as the specific name.